Heya, small demo showing sync between nodysseus instances. While this is on a desktop, it also works between two different devices so long as they are online at the same time

I don't understand. What does this tool do?

Live collaboration over a graph, like Google Docs allows over a text document?

It's a node-based wrapper around javascript. In this example, you can see the html_element changing in the bottom left. There are also threejs and other library wrappers, but ultimately it can do whatever is possible in the environment it's running (in this case a browser).